Pub Date : 1900-01-01DOI: 10.1002/(SICI)1099-1131(200002)13:1%3C79::AID-DAC409%3E3.0.CO;2-I
G. Feng, T. Yum
With e!ective bandwidth concept encapsulating cell-level behaviour, asynchronous transfer mode (ATM) network design and analysis at the call-level may be formulated in the framework of circuit-switched loss networks. In this paper, we develop an analytical framework for a kind of multiparty videoconferencing in the VP-based ATM network at call-level. For this kind of conference, only the video of the current speaker is broadcast to other conferees. We "rst address several conference management issues in the VP-based ATM network, including the bandwidth allocation strategies, routing rule, call admission policy and speaker change management. Next, we formulate a tra$c model for the conferences. Since an exact analysis of such a multiparty conference network is mathematically intractable, an approximate analysis for such conferences in a fully connected VP network is performed. The key of our method is to make use of the reduced-load approximation and open Jackson network model to derive the tra$c loads from new conferences as well as that from the speaker change of the on-going conferences. Our study shows that the proposed analysis can give accurate predictions of the blocking probabilities for the new conference calls as well as video freeze probabilities for the on-going conferences. Copyright ( 2000 John Wiley & Sons, Ltd.
e !有效带宽概念封装小区级行为，异步传输模式(ATM)网络在呼叫级的设计和分析可以在电路交换损耗网络的框架下制定。本文开发了一种基于虚拟网关的ATM网络中呼叫级多方视频会议的分析框架。对于这种会议，只有当前发言人的视频播放给其他与会者。本文首先讨论了基于虚拟网关的ATM网络中的会议管理问题，包括带宽分配策略、路由规则、呼叫接纳策略和演讲者变更管理。接下来，我们为会议制定了一个额外的c模型。由于对这种多方会议网络的精确分析在数学上是难以处理的，因此对完全连接的VP网络中的此类会议进行了近似分析。该方法的关键是利用减少负荷近似和开放的Jackson网络模型来推导新会议和正在进行的会议的演讲者变化的额外负荷。我们的研究表明，所提出的分析可以准确地预测新的电话会议的阻塞概率以及正在进行的会议的视频冻结概率。版权所有(2000 John Wiley & Sons, Ltd.)
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